Examples of org.apache.commons.collections4.MapIterator

org.apache.commons.collections4.FunctorException
Defines an iterator that operates over a Map.
This iterator is a special version designed for maps. It can be more efficient to use this rather than an entry set iterator where the option is available, and it is certainly more convenient.
A map that provides this interface may not hold the data internally using Map Entry objects, thus this interface can avoid lots of object creation.
In use, this iterator iterates through the keys in the map. After each call to next(), the getValue() method provides direct access to the value. The value can also be set using setValue().
```
 MapIterator it = map.mapIterator(); while (it.hasNext()) { String key = it.next(); Integer value = it.getValue(); it.setValue(value + 1); } 
```
@param < K> the type of the keys in the map @param < V> the type of the values in the map @since 3.0 @version $Id: MapIterator.java 1469004 2013-04-17 17:37:03Z tn $

            return "{}";
        }
        StringBuffer buf = new StringBuffer(32 * size());
        buf.append('{');


        MapIterator it = mapIterator();
        boolean hasNext = it.hasNext();
        while (hasNext) {
            Object key = it.next();
            Object value = it.getValue();
            buf.append(key == this ? "(this Map)" : key).append('=').append(value == this ? "(this Map)" : value);


            hasNext = it.hasNext();
            if (hasNext) {
                buf.append(',').append(' ');
            }
        }

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     * @param key1 the first key
     * @return true if any elements were removed
     */
    public boolean removeAll(Object key1) {
        boolean modified = false;
        MapIterator it = mapIterator();
        while (it.hasNext()) {
            MultiKey multi = (MultiKey) it.next();
            if (multi.size() >= 1 && (key1 == null ? multi.getKey(0) == null : key1.equals(multi.getKey(0)))) {
                it.remove();
                modified = true;
            }
        }
        return modified;
    }

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     * @param key2 the second key
     * @return true if any elements were removed
     */
    public boolean removeAll(Object key1, Object key2) {
        boolean modified = false;
        MapIterator it = mapIterator();
        while (it.hasNext()) {
            MultiKey multi = (MultiKey) it.next();
            if (multi.size() >= 2 && (key1 == null ? multi.getKey(0) == null : key1.equals(multi.getKey(0))) && (key2 == null ? multi.getKey(1) == null : key2.equals(multi.getKey(1)))) {
                it.remove();
                modified = true;
            }
        }
        return modified;
    }

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     * @param key3 the third key
     * @return true if any elements were removed
     */
    public boolean removeAll(Object key1, Object key2, Object key3) {
        boolean modified = false;
        MapIterator it = mapIterator();
        while (it.hasNext()) {
            MultiKey multi = (MultiKey) it.next();
            if (multi.size() >= 3 && (key1 == null ? multi.getKey(0) == null : key1.equals(multi.getKey(0))) && (key2 == null ? multi.getKey(1) == null : key2.equals(multi.getKey(1))) && (key3 == null ? multi.getKey(2) == null : key3.equals(multi.getKey(2)))) {
                it.remove();
                modified = true;
            }
        }
        return modified;
    }

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     * @param key4 the fourth key
     * @return true if any elements were removed
     */
    public boolean removeAll(Object key1, Object key2, Object key3, Object key4) {
        boolean modified = false;
        MapIterator it = mapIterator();
        while (it.hasNext()) {
            MultiKey multi = (MultiKey) it.next();
            if (multi.size() >= 4 && (key1 == null ? multi.getKey(0) == null : key1.equals(multi.getKey(0))) && (key2 == null ? multi.getKey(1) == null : key2.equals(multi.getKey(1))) && (key3 == null ? multi.getKey(2) == null : key3.equals(multi.getKey(2))) && (key4 == null ? multi.getKey(3) == null : key4.equals(multi.getKey(3)))) {
                it.remove();
                modified = true;
            }
        }
        return modified;
    }

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  }


  //loads the files and removes words which occur less than 5 tims
  public void loadProgram() throws FileNotFoundException
  {
    Bag wordBag = new HashBag();


    //Load all the medical files in the directory
    File[] fileList = new File(recordsDir).listFiles();
    for (int i = 0; i<fileList.length; i++) {
      loadFile(fileList[i].toString(), wordBag);
    }


    //dump bag into frequent who appear in 5 or more medical records
    for (Object obj : wordBag.uniqueSet()) {
      if (wordBag.getCount(obj) > 4){
        frequent.add((String)obj);
      }
    }


  }

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     * @param object  the input object
     * @return never
     * @throws FunctorException always
     */
    public boolean evaluate(final T object) {
        throw new FunctorException("ExceptionPredicate invoked");
    }

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     *
     * @return never
     * @throws FunctorException always
     */
    public T create() {
        throw new FunctorException("ExceptionFactory invoked");
    }

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        public T create() {
            try {
                return clazz.newInstance();
            } catch (final Exception ex) {
                throw new FunctorException("Cannot instantiate class: " + clazz, ex);
            }
        }

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        try {
            final Class<?> cls = input.getClass();
            final Method method = cls.getMethod(iMethodName, iParamTypes);
            return (O) method.invoke(input, iArgs);
        } catch (final NoSuchMethodException ex) {
            throw new FunctorException("InvokerTransformer: The method '" + iMethodName + "' on '" +
                                       input.getClass() + "' does not exist");
        } catch (final IllegalAccessException ex) {
            throw new FunctorException("InvokerTransformer: The method '" + iMethodName + "' on '" +
                                       input.getClass() + "' cannot be accessed");
        } catch (final InvocationTargetException ex) {
            throw new FunctorException("InvokerTransformer: The method '" + iMethodName + "' on '" +
                                       input.getClass() + "' threw an exception", ex);
        }
    }

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